package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {
    private static final Long BEGIN_TIMESTAMP=1640995200L;
    private static final int COUNT_BITS=32;

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    public Long nextId(String keyPrefix){
        LocalDateTime now = LocalDateTime.now();
        Long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        Long timestamp = nowSecond-BEGIN_TIMESTAMP;

        String date = now.format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));
        Long count = stringRedisTemplate.opsForValue().increment("icr"+keyPrefix+":"+date);

        return timestamp<<COUNT_BITS | count;
    }

}
